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Filters Contacts (Less) U.S. Geological Survey - ScienceBase U.S. Geological Survey Ecosystems Water Resources U.S. Geological Survey Energy and Minerals Natural Hazards Forest and Rangeland Ecosystem Science Center Wetland and Aquatic Research Center Core Science Systems Fort Collins Science Center California Water Science Center Geology, Geophysics, and Geochemistry Science Center Upper Midwest Environmental Sciences Center Columbia Environmental Research Center Central Midwest Water Science Center Western Ecological Research Center Geosciences and Environmental Change Science Center Upper Midwest Water Science Center Southwest Biological Science Center New York Water Science Center FRESC Science Data Coordinator Earthquake Hazards Program Nicholas M Enwright Eastern Ecological Science Center Land Resources Great Lakes Science Center Earth Resources Observation and Science (EROS) Center Geology, Minerals, Energy, and Geophysics Science Center Lower Mississippi-Gulf Water Science Center CERC Data Managers Holly J Beck Central Energy Resources Science Center Florence Bascom Geoscience Center Oklahoma-Texas Water Science Center Geologic Hazards Science Center Northern Prairie Wildlife Research Center Oregon Water Science Center New England Water Science Center Volcano Science Center South Atlantic Water Science Center Earth System Processes Division Geology, Energy & Minerals Science Center Pacific Island Ecosystems Research Center Caribbean-Florida Water Science Center Maryland-Delaware-D.C. Water Science Center National Wildlife Health Center Ohio-Kentucky-Indiana Water Science Center Steve Hanser Colorado Water Science Center More... View Results as: JSON ATOM CSV

Blood variable data for clinically normal and clinically abnormal Mojave Desert tortoises (Gopherus agassizii) in 2013 To improve our understanding of health and immune function in tortoises, we evaluated both standard blood diagnostic (body condition, hematologic, plasma biochemistry values, trace elements, plasma proteins, vitamin A levels) and gene transcription profiles in 21 adult tortoises (11 clinically abnormal; 10 clinically normal) from Clark County, NV, USA. Necropsy and histology evaluations from clinically abnormal tortoises revealed multiple physiological complications, with moderate to severe rhinitis or pneumonia being the primary cause of morbidity in all but one of the examined animals. Improved methods for health assessments are an important element of monitoring tortoise population recovery and can support the... Categories: Data; Tags: Clark County, Nevada, Hidden Valley, USGS Science Data Catalog (SDC), biota, health Chemical and isotopic composition of produced waters from the lower Eagle Ford Group, south-central Texas This dataset contains chemical and isotopic data from 39 produced water samples collected from sealed separators containing water from horizontal hydrocarbon wells in the lower Eagle Ford Group. The samples were collected from Lavaca and Gonzales counties, Texas in December, 2015. All wells had been in production for longer than 6 months and had produced more than 10,000 barrels (~160,000 liters) of water. Categories: Data; Tags: Energy Resources, Texas, USGS Science Data Catalog (SDC), geochemistry, groundwater geochemistry, All tags... isotope geochemistry, oil resources, Fewer tags Calculated back trajectory coordinates for air masses contributing to five selected precipitation-mercury deposition episodes at a National Atmospheric Deposition Program monitoring site in southeastern Indiana during 2009 to 2015 This data release contains tabular digital data describing calculated hourly back trajectory position coordinates for air masses contributing to five selected precipitation-mercury deposition episodes at National Atmospheric Deposition Program monitoring site IN21 (National Atmospheric Deposition Program, 2017) in southeastern Indiana during 2009‒2015. The air pollution transport and dispersion modeling system HYSPLIT (Stein et. al, 2015) was used to calculate the back trajectory position coordinates during 48 hours preceding the start of each episode. The 40-km gridded input data to HYSPLIT were from National Oceanic and Atmospheric Administration (2017). Continuous, digital precipitation depth data were recorded... Categories: Data; Tags: Indiana, USGS Science Data Catalog (SDC), air pollution, atmospheric deposition, dispersion model, All tags... precipitation, transport model, Fewer tags The chemistry of eolian quartz dust and the origin of chert Temporal and spatial sources of silica for chert remain poorly constrained. Modern sources to the worlds oceans include silica in rivers > aeolian (dust) deposition > sea floor vents and submarine weathering. However, changes in aridity and dust flux during the Phanerozoic may explain variations in the ocean silica cycle and times and places of chert formation. The chemistry of fine quartz dust (FQD) provides a chemical mechanism for the transformation of FQD to polymorphs of silica in chert; FQD is readily dissolved, then reprecipitated as Opal-A by either biotic or abiotic processes. An unequivocal relation between increases in dust flux and biogenic opal-A in the western Pacific Ocean during the past 200 kyr... Tags: Africa, Energy Resources, Geochemistry, International, Soil Sciences, All tags... USGS Science Data Catalog (SDC), aridity, chalcedony, chemistry, chert, deposition, dust, eolian, flocculates, gypsum, loess, microcrystalline, opal, porcellanite, quartz, silica polymorphs, silt, wind, Fewer tags Pathology and bacteriology of 178 tadpoles with histologically confirmed Severe Perkinsea Infections: Data (i) This dataset presents macroscopic and microscopic pathological findings and bacteriology of 178 tadpoles diagnosed with Severe Perkinsea Infections. (ii) Specimen were collected and submitted to the NWHC as part of mortality investigations and collection of specimen from apparently healthy populations as part of ongoing amphibian health monitoring. (iii) Necropsies and gross evaluation of carcasses were carried out under a dissecting microscope. (iv) Severe Perkinsea Infection was confirmed in each specimen by histological observation of pathological changes in tissues with presence of Perkinsea-like organisms in at least one organ, including brain, eyes, gastrointestinal tract, gills, heart, liver, lungs, kidney,... Categories: Data; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: USGS Science Data Catalog (SDC), Unites States of Ameica, amphibian, biota, case definition, All tags... emerging infectious disease, histopathy, pathogenesis, pathogenic Perkinsea Clade, ranavirus, tadpoles, Fewer tags Reproductive ecology data for female Agassiz's desert tortoises (Gopherus agassizii) in Joshua Tree National Park, USA These data were compiled to evaluate the reproductive ecology of Agassiz's desert tortoises (Gopherus agassizzi) in the Sonoran Desert of California using two populations within Joshua Tree National Park, including five reproductive seasons that spanned 20 years (1997-1999, 2015-2016). Compared to their conspecifics inhabiting the Mojave Desert, the reproductive ecology of G. agassizii in the Sonoran Desert is understudied. Climatic variation between the two deserts can affect reproductive ecology, including fecundity and clutch phenology. Mature female tortoises (straight-line carapace length ≥ 20 cm) outfitted with radiotransmitters were located and X-radiographed approximately every 10-14 days during the reproductive... Categories: Data; Tags: Agassiz's desert tortoise, California, Ecology, Geography, Gopherus agassizii, All tags... Information Sciences, Joshua Tree National Park, Sonoran Desert, USGS Science Data Catalog (SDC), Wildlife Biology, X-radiography, X-ray egg width, biota, climatic variation, clutch number, clutch phenology, clutch size, ecology, egg production, egg size, fecundity, field monitoring, field sampling, nests, reproductive ecology, size, tortoise, Fewer tags Distribution and mapping of the snail Cerithideopsis (Cerithidea) californica at Carpinteria Salt Marsh, California USA, June to August 2012 We collected detailed spatial data on the density and size distribution of intertidal snails as part of a broader effort to understand food webs in California estuaries. The survey area was Carpinteria Salt Marsh, California USA, which comprises 9 Ha tidal channels, 2 Ha salt flats, 17 Ha upland habitat, 6 Ha tidal pans, 52 Ha vegetated marsh, 2 Ha tidal flats. Using nearly 4,000 transects in potential snail habitat, we mapped snails throughout the estuary. Specifically, we systematically placed transects at intervals stratified within targeted habitat types: channels, pans, or marsh (or planar habitat that was mixed marsh and pan). At a quarter of the quadrats, we also estimated snail size-frequency distributions.... Categories: Data; Tags: California, Carpinteria, Carpinteria Salt Marsh Reserve, Santa Barbara County, USGS Science Data Catalog (SDC), All tags... distribution, estuary, habitat, mapping, salt marsh, snail, trematodes, Fewer tags Susceptibility and antibody response of the laboratory model zebra finch (Taeniopygia guttata) to West Nile Virus: Data The data set contains the results of experimental challenge of captive zebra finches with an American crow isolate of West Nile virus (WNV). Data include infectivity, mortality, viremia, oral shedding of virus, and serology for anti- WNV antibodies. Australian and Timor zebra finches were used in this study and both are useful as a laboratory model of an avian species with moderate susceptibility to WNV. Categories: Data; Types: Citation; Tags: National Wildlife Health Center, USGS Science Data Catalog (SDC), West Nile virus, immunoassay, qRT-PCR, All tags... survival analysis, Fewer tags Annual California Sea Otter Census - 1985-2014 Spring Census Summary This dataset represents an archived record of annual California sea otter surveys from 1985-2014. Survey procedures involve counting animals during the "spring survey" -- generally beginning in late April or early May and usually ending in late May early June but may extend into early July, depending on weather conditions. Annual surveys are organized by survey year and within each year, three shapefiles are included: census summary of southern sea otter, extra limit counts of southern sea otter, and range extent of southern sea otter. The surveys, conducted cooperatively by scientists of the U.S. Geological Survey, California Department of Fish and Wildlife, U.S. Fish and Wildlife Service and Monterey Bay Aquarium... Categories: Data; Tags: California, Central California Coastal, Coast, Southern California Coastal, USGS Science Data Catalog (SDC), All tags... aerial counts, biota, distribution, environment, ocean, range, sea otter census, sea otters, sea otters, shore counts, Fewer tags Laboratory experiment data—turbidity response to increasing silt and clay concentration These data were compiled during a laboratory experiment showing the turbidity response to increasing silt and clay concentration. The sediment used for the laboratory experiment was collected in the Grand Canyon study area, from the bank of the Little Colorado River, approximately 1 kilometer upstream from its confluence with the Colorado River. The sediment was passed through a 63 µm sieve to isolate the silt-and-clay-size fraction. The silt and clay was completely dried in an oven (at 105 degrees Celsius for 12 hours), weighed, mechanically disaggregated, and added in stages to a measured volume of water to calculate concentration. The sediment was kept in suspension with an electric stirrer and turbidity was... Tags: Arizona, Colorado River, Grand Canyon, Information Sciences, Little Colorado River, All tags... Marble Canyon, USGS Science Data Catalog (SDC), Water Quality, Water Resources, clay concentration, false low turbidity, laboratory experiment data, linear response, maximum recording level, maximum response, negative response, silt concentration, turbidity, Fewer tags Histopathological assessment of the digestive gland of a freshwater snail (Lymnaea stagnalis) exposed to uranium This dataset consists of measurements of the digestive gland in the freshwater snail Lymnaea stagnalis orally exposed to uranium. The objective of the study was to assess the morphological effects of uranium on the snail digestive gland by light microscopy. Laboratory-cultured L stagnalis were exposed to either synthetic or natural solid phases of uranium and a subset (6 controls and 6 exposed) were euthanized and fixed in 10% neutral buffered formalin for histopathological assessment. Slides were processed and stained with hematoxalin and eosin as per standard procedure (Luna 1968). The size of each sample, the length and width of digestive gland tubules (5 random glands per sample) and height of digestive cells... Categories: Data; Tags: Environmental Health, Lymnaea stagnalis, Madison, Wisconsin, USGS Science Data Catalog (SDC), Wildlife Biology, All tags... Wildlife Disease, digestive gland, uranium, Fewer tags Exotic and perennial grass cover for pastures in the Soda Fire (2016) The point data file ("Soda Fire Point and Pasture Data (2016).Point Data.csv") includes 2016 vegetative cover values of exotic annual grass and perennial grass measured within three different types of plots for 75 pastures in the Soda Fire, which burned in 2015: 6m² plot using a grid-point intercept photo software, SamplePoint (Booth et al. 2006), 1m² quadrat using an unguided rapid ocular estimate in the field, 531m² circular plot using an unguided rapid ocular estimate in the field. Smaller plots were nested within larger plots. The pasture data file ("Soda Fire Point and Pasture Data (2016).Pasture Data.csv") includes pasture level metrics of area, elevation, precipitation, slope, heatload, soils, and herbicide... Categories: Data; Types: Citation; Tags: Botany, Ecology, Idaho, Idaho BLM, Land Use Change, All tags... Malheur County, Oregon, Owyhee County, Soda Wildfire, USGS Science Data Catalog (SDC), biota, exotic annual grass, fires, grid point intercept, perennial grass, sample size, vegetation, vegetation cover, Fewer tags Site identification, location, temperature and CO2 flux from diffuse emission measurement at the Tiptop coal mine fire, Kentucky (2009) The dataset consists of site identification, location, temperature and CO2 flux from diffuse emission measurement at the Tiptop fire. A total of 40 CO2 flux measurements were made at 27 locations, including five points (seven measurements) outside of the active coal fire area. Categories: Data; Tags: Energy Resources, Environmental Health, Kentucky, Perry County, USGS Science Data Catalog (SDC), All tags... coal resources, fires, Fewer tags Contiguous US and Global streamflow gages measuring zero flow We report the site number and locations of 5798 streamflow gages displaying zero flow for at least one day in their daily records. 4891 of these gages are from the GRDC network, and 906 are USGS gages in the contiguous US. Additionally, provisional data for two USGS gages 1) Rio Puerco near Bernardo, NM (USGS site: 08353000) and 2) Agua Fria River Near Mayer, AZ (USGS site: 09512500) are provided to illustrate zero flow record behaviors. Categories: Data; Tags: Global, United States, Hydrology, Intermittent streams, USGS Science Data Catalog (SDC), Water Resources, All tags... inlandWaters, Fewer tags Data Used to Characterize Peak Streamflows and Flood Inundation Resulting from Hurricane Harvey of Selected Areas in Southeastern Texas and Southwestern Louisiana, August–September 2017 The U.S. Geological Survey (USGS) worked in cooperation with the Federal Emergency Management Agency (FEMA) to document the August and September, 2017 Hurricane Harvey storm event in southeastern Texas and southwestern Louisiana. Hurricane Harvey was the most significant rainfall event in United States history in scope and rainfall totals since rainfall records began during the 1880s. From August 25 through September 1, 2017, some areas in southeastern Texas received more than 60 inches of rain; large areas received more than 40 inches of rain. This data release contains the flood inundation polygons, flood-depth rasters, mapped boundaries, and high-water mark (HWM) locations for the selected river basins, coastal... Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: USGS Science Data Catalog (SDC), Water Resources Investigating the effects of broad ion beam milling to sedimentary organic matter To test if reflectance increases to sedimentary organic matter (vitrinite) caused by broad ion beam (BIB) milling were related to molecular aromatization and condensation, we used Raman and Fourier transform infrared (FTIR) spectroscopies to evaluate potential compositional changes in the same vitrinite locations pre- and post-BIB milling. The same locations also were examined by atomic force microscopy (AFM) to determine topographic changes caused by BIB milling (as expressed by the areal root-mean-square roughness parameter Rq). Samples consisted of four medium volatile bituminous coals. We used a non-aggressive BIB milling approach with conditions of [(5 min, 4 keV, 15°incline, 360° rotation at 25 rpm and 100%... Categories: Data; Tags: Bituminous Coal, Broad Ion Beam, Coal resources, Energy Resources, Geochemistry, All tags... Ion Milling, Pennyslvania, Sedimentary Organic Matter, Thermal Maturity, USGS Science Data Catalog (SDC), Vitrinite reflectance, Fewer tags Assessment of Field and Laboratory Methods for the Detection and Analyses of Cyanobacteria and Cyanotoxins in Texas Reservoirs In cooperation with the Texas Commission on Environmental Quality (TCEQ), the U.S. Geological Survey (USGS) utilized various field and laboratory methods to determine the presence and concentration of cyanobacteria, cyanotoxins, and taste-and-odor compounds in Texas water bodies. This data release documents the results from water-quality samples collected from 41 water bodies in Texas during 2016–19. Both qualitative and quantitative field and laboratory methods were performed. Analyses included phytoplankton taxonomy, measurements of phytoplankton biomass, and concentrations of cyanotoxins, taste-and-odor compounds, and photosynthetic pigments. Water-quality samples were also collected to provide supporting data... Tags: Benbrook Lake, Braunig Lake, Caddo Lake, Caruth Lake, Cedar Creek Reservoir, All tags... E V Spence Reservoir, Fairfield Lake, Fort Phantom Hill Lake, Grapevine Lake, Jim Chapman Lake, Lake Arrowhead, Lake Buchanan, Lake Cisco, Lake Fork Reservoir, Lake J B Thomas, Lake Kemp, Lake Kiowa, Lake Lewisville, Lake Meredith, Lake Murvaul, Lake O' the Pines, Lake Palestine, Lake Palo Pinto, Lake Tawakoni, Lake Texoma, Lake Whitney, Lavon Lake, Millers Creek Reservoir, NRCS Upper Bosque River, O H Ivie Reservoir, Pat Mayse Lake, Phelps Lake, Ray Hubbard Lake, Ray Roberts Lake, Richland Chambers Reservoir, Sheldon Reservoir, Somerville Lake, Stillhouse Hollow Lake, Texas, Twin Buttes Reservoir, USGS Science Data Catalog (SDC), Water Quality, Water Resources, Wright Patman Lake, algae, blue-green algae, cyanobacteria, phytoplankton, water quality, Fewer tags Chemistry Data from Southern Florida Canals Collected in Support of the Aquatic Cycling of Mercury in the Everglades Project Several canals in southern Florida run from Lake Okeechobee through the Everglades Agricultural Area (EAA) and feed water to the northern Everglades. Agricultural and water-management practices affect the water quality of these canals. Fertilizers added in the EAA flow into the canals and are transported to treatment areas which remove much of the phosphorous in the water, but are not as effective in removing dissolved sulfate. Elevated sulfate concentrations, found downstream in the Water Conservation Areas in the northern Everglades, can stimulate sulfur-reducing bacteria which can also convert inorganic mercury to methyl mercury, a bioaccumulative neurotoxin. Chemistry data at 25 canal sites in southern Florida... Categories: Data; Tags: Broward County, Energy Resources, Geochemistry, Miami-Dade County, Palm Beach County, All tags... The Everglades, USGS Science Data Catalog (SDC), contaminant transport, datasets, nonpoint-source pollution, sulfur, surface water quality, Fewer tags USGS National and Global Oil and Gas Assessment Project-Eastern Great Basin Province, Delle Phosphatic Member Shale Assessment Unit Boundaries and Assessment Input Data Forms This data release contains the boundaries of assessment units and input data for the assessment of continuous oil and gas resources in the Delle Phosphatic Member of the Mississippian Woodman Formation, western Utah, eastern Nevada and southeastern Idaho. The Assessment Unit is the fundamental unit used in the National Assessment Project for the assessment of undiscovered oil and gas resources. The Assessment Unit is defined within the context of the higher-level Total Petroleum System. The Assessment Unit is shown herein as a geographic boundary interpreted, defined, and mapped by the geologist responsible for the province and incorporates a set of known or postulated oil and (or) gas accumulations sharing similar... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Assessment Unit, Continuous Assessment Unit, Delle Phosphatic Member Shale Gas, Delle Phosphatic Member Shale Oil, Energy Resources, All tags... Energy Resources, Geology, NOGA2000, National Assessment of Oil and Gas, Natural Gas, Oil, OilGas, Resource Assessment, State of Idaho, State of Nevada, State of Utah, USGS Science Data Catalog (SDC), Unconventional Assessment Unit, United States of America, energy resources, geoscientificInformation, natural gas resources, oil resources, petroleum, Fewer tags 1930-1932 Gill net data from Lake Michigan These data describe the catch and biological data from 363 bottom-set gill-net lifts distributed throughout Lake Michigan (including main basin and Green Bay) between April and November in 1930–1932. Data collected from the R/V Fulmar were recorded in notebooks and are now archived at the U.S. Geological Survey’s Great Lakes Science Center. Each lift included 1–7 gangs of linen gill nets. Each gang comprised 3–5 panels each having a length of 155 m, a height of 1.5 m, and a (stretch-)mesh size of either 60, 64, 67, 70, or 76 mm. The digitization of the Fulmar data notebooks was started in the late 1990s and finished in this study. Categories: Data; Tags: Aquatic Biology, Cisco, Ecology, Fishing with Benthic Fixed Gear, Gill net, All tags... Lake Michigan, Lake Michigan, USGS Science Data Catalog (SDC), benthic ecosystems, biota, fish, fisheries biology, fishery management, freshwater ecosystems, habitats, inland fishery resources, Fewer tags 1 2 3 4 5 ... »